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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Photo-catalytic degradation of toxic dye amaranth on TiO
2
/UV in aqueous suspensions
Materials Science and Engineering C, Volume 32, No. 1, Year 2012
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Description
The photo-catalytic degradation of an azo dye - Amaranth (AM) - has been investigated in TiO2/UV aqueous suspensions. The results obtained from the experiments during H2O2/TiO2 addition show that the highest decolorization rate is provided by the combination of (UV + TiO2 + H2O2). The decolorization efficiencies were 17%, 26%, 38% and 64% in the runs UV, UV + H2O2, UV + TiO2 and (UV + TiO2 + H2O2) after approximately 100 min illumination periods, respectively. The observed dye degradation rates followed pseudo-first order kinetics with respect to the substrate concentration under the experimental conditions used. Different experimental conditions, such as temperature, pH and presence of electron acceptor were investigated. The temperature effect was investigated at the range of 293-313 K and it was observed that decolorization rate increased by the increase in temperature. Chemical oxygen demand and dye absorbance of the photodegraded dye solution substantially decreased. Effect of pH was also investigated and it was observed that the lower the pH the higher the degradation. In addition, an enhancement in the photodegradation rate was observed by the addition of hydrogen peroxide as an electron acceptor. The adsorption trends of Amaranth at various initial concentrations followed the Langmuir isotherm trend. This work adds to the global discussion on the role of the advanced oxidation processes in water treatment. © 2011 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Gupta, Vinod Kumar
India, Roorkee
Indian Institute of Technology Roorkee
Saudi Arabia, Dhahran
King Fahd University of Petroleum and Minerals
Jain, Rajeev K.
India, Gwalior
Jiwaji University
Mittal, Alok
India, Bhopal
Maulana Azad National Institute of Technology
Saleh, Tawfik A.
Saudi Arabia, Dhahran
King Fahd University of Petroleum and Minerals
Nayak, Arunima K.
India, Roorkee
Indian Institute of Technology Roorkee
Agarwal, Shilpi
India, Gwalior
Jiwaji University
Sikarwar, Shalini
India, Gwalior
Jiwaji University
Statistics
Citations: 710
Authors: 7
Affiliations: 4
Identifiers
Doi:
10.1016/j.msec.2011.08.018
ISSN:
09284931
Research Areas
Environmental